Key Features of Counterbalanced And Non-Counterbalanced Fire Shutters

• The roller drum consists of an extremely rigid steel tube sheathed over a drive assembly at each end.
• The drive assembly is made up of steel discs fitted to a solid polished-steel shaft
• The shaft at the drive end is key-wayed to accept the drive sprocket.
• The protruding ends of the shafts are fitted with self-aligning bearings head plates form the support for the entire door roll.
• The diameter and thickness of the steel tube and shaft are determined by the size of the door.
• Counterbalanced models shall have oil-tempered torsion springs incorporated into the roller drum.
• Sturdily designed scrolled profile roll formed from 1.0mm or 1.2mm thick galvanized steel with malleable iron end clips secured to alternate slats to prevent lateral movement.
• Manually operated models are equipped with chain-operated hoists.
• Both types of operators are supplied with push-button controls, upper and lower limit switches and thermal overload protection.